Fixed typo in IDs of scrollpanel
Changed logging of render image applying

 - There is no logging message anymore in case a image tag lacks the
   filename attribute. Reporting this seemed like a good idea at
   first, how ever in case the image tags are used to dynamically
   display a image, this message is not useful and spams the output.
 - There is a logging message now in case there is a filename
   attribute but the image loader fails to fetch a image assigned to
   this filename. In case this happens its very likely that something
   is wrong with the resources or the filename is wrong.